squeak: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/squeak - from package: squeak-vm

You may install the required package with command apt-get install {package}

Error in other languages:
squeak: bevel nie gevind nie
squeak: comandă negăsită
squeak: comando não encontrado
squeak: commande introuvable
squeak: command not found
squeak: käsku ei ole
squeak: không tìm thấy lệnh
squeak: komanda nerasta
squeak: Kommando nicht gefunden.
squeak: kommandot finns inte
squeak: komut yok
squeak: nie znaleziono polecenia
squeak: níor aimsíodh an t-ordú
squeak: no se encontró la orden
squeak: no s'ha trobat l'ordre
squeak: opdracht niet gevonden
squeak: parancs nem található
squeak: perintah tidak ditemukan
squeak: príkaz nenájdený
squeak: příkaz nenalezen
squeak: команда не найдена
squeak: командата не е открита
squeak: 命令找不到
squeak: コマンドが見つかりません